Huawei H12-831_V1.0 Exam With Confidence Using Practice Dumps

Route Targets (RTs) are BGP extended communities that control the import and export of VPNv4 routes between VPN instances.

A PE exports routes with its configured Export RT (ERT). A receiving PE imports those routes only when the advertised RT matches one of its Import RTs (IRTs).

In option A, PE1 and PE2 use different RTs, preventing direct route exchange. PE3 imports and exports both RTs, enabling communication with both sites.

In option C, PE1 and PE2 export RT 200:1 and import RT 100:1. PE3 exports RT 100:1 and imports RT 200:1. This creates communication between PE3 and both spokes without allowing direct communication between the spokes.

Options B and D permit route exchange between PE1 and PE2.

Therefore, A and C satisfy the requirements.

HCIP-Datacom-Advanced Routing & Switching Technology V1.0 Training Material.pdf

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Comprehensive and Detailed In-Depth Explanation:

Understanding the BGP Network Topology in the Question:

EBGP Peering

Each router forms EBGP peer relationships with directly connected neighbors.

This is a fully meshed topology, meaning each router exchanges BGP routes with its adjacent routers.

Routing Information for 192.168.1.0/24

R1 and R4 import the static route 192.168.1.0/24 into BGP.

Since BGP prefers the shortest AS path, traffic to 192.168.1.0/24 will follow the shortest path to R1 or R4.

Route Analysis for Each Statement:

Statement A: R6 → R5 → R4 ✅ (Correct)

R6 does not have a direct route to 192.168.1.0/24, so it must rely on BGP advertisements from its EBGP neighbors.

R5 learns the route to 192.168.1.0/24 from R4.

Therefore, R6 forwards traffic to R5, and then R5 sends it to R4.

✅ Correct path: R6 → R5 → R4

Statement B: R5 → R4 ✅ (Correct)

R5 is directly connected to R4, and since R4 advertises the 192.168.1.0/24 route via BGP,

R5 will forward traffic directly to R4 as the shortest AS path.

✅ Correct path: R5 → R4

Statement C: R2 → R1 ✅ (Correct)

R2 is directly connected to R1 and learns the 192.168.1.0/24 route from R1 via BGP.

Since R1 advertises the static route, R2 forwards traffic directly to R1.

✅ Correct path: R2 → R1

Statement D: R3 → R2 → R1 ✅ (Correct)

R3 is directly connected to R2 and learns the 192.168.1.0/24 route from R2 via BGP.

Since R2 prefers R1 as the shortest AS path to 192.168.1.0/24,

R3 will send traffic to R2, and R2 will send it to R1.

✅ Correct path: R3 → R2 → R1

Final Conclusion:

✅ A. The path for traffic from R6 to 192.168.1.0/24 is R6 → R5 → R4.

✅ B. The path for traffic from R5 to 192.168.1.0/24 is R5 → R4.

✅ C. The path for traffic from R2 to 192.168.1.0/24 is R2 → R1.

✅ D. The path for traffic from R3 to 192.168.1.0/24 is R3 → R2 → R1.

Thus, the correct answers are: A, B, C, D.